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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
IJCMAS is now DOI (CrossRef) registered Research Journal. The DOIs are assigned to all published IJCMAS Articles.
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com / submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2017: 100.00
NAAS RATING 2018: 5.38

Int.J.Curr.Microbiol.App.Sci.2017.6(12): 765-771
DOI: https://doi.org/10.20546/ijcmas.2017.612.081


Efficacy of Combined Formulations of Fungicides in Managing Late Blight Disease of Potato Caused by Phytophthora infestans (Mont.) de Bary
Susmita Jha1*, Surajit Khalko1, Mushineni Ashajyothi2, Sekhar Bandyopadhyay1 and Ayon Roy1
1Department of Plant Pathology, Uttar Banga Krishi Viswavidyalaya,Cooch Behar, West Bengal, India
2Department of Plant Pathology, Indian Agricultural Research Institute, New Delhi, India
*Corresponding author
Abstract:

This study involves the efficacy testing of six new generation for the management of most devastative and cosmopolitan disease of Potato i.e., Late blight caused by Phytophthora infestans (Mont.) de Bary. To identify most important weather parameter for disease spread, the relation between daily temperature, rainfall and relative humidity and late blight development scenario throughout the season was studied. The study was conducted, in two consecutive crop seasons 2015-2016 and 2016-2017. Though all the fungicides effectively reduced the disease index over the control, out of six test chemicals, combination of Iprovalicarb 5.5% + Propineb 61.25% (T6) was found to be the best with least disease (AUDPC - 728.519) progress and highest projected yield (16.96 t/ha) and BC ratio (1: 0.777). Pyraclostrobin 5% + Metiram 55% was statistically at par with T6 showing less (AUDPC - 757.037) with 16.13 t/ha projected yield and maximum BC ratio (1:0.7645). Since there are huge reports on Phytophthora showing resistance to Phenylamide fungicides (Metalaxyl), most commonly used fungicides for late blight control in India and abroad, this combination of Iprovalicarb 5.5% + Propineb 61.25% can be suggested as an alternative for blight management. Mixtures of compatible chemicals with alternative and optimum dose sprays will effectively help in reducing losses caused by diseases as well as help in increasing potato tuber yield.


Keywords: Potato, Late Blight, AUDPC, Weather relation, Chemical management, Yield loss.
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How to cite this article:

Susmita Jha, Surajit Khalko, Mushineni Ashajyothi, Sekhar Bandyopadhyay and Ayon Roy. 2017. Efficacy of Combined Formulations of Fungicides in Managing Late Blight Disease of Potato Caused by Phytophthora infestans (Mont.) de Bary.Int.J.Curr.Microbiol.App.Sci. 6(12): 765-771. doi: https://doi.org/10.20546/ijcmas.2017.612.081